I am an American who has traveled extensively within, in, and out of Russia with a bike with US plates. Several comments:
1) Not to nitpick, but this subforum is not where I would have posted this query; there are "Route Planning" and "Trip Paperwork" subforums which would have been a better choice; sometimes responses in this subforum are not especially helpful.

2) I have to agree with others that the fact that you have all the documents required in the US is not really relevant--you're not in Kansas anymore... This side has many threads about what documents are necessary for crossing various borders, so more advance research would have been helpful.

3) As an aside, at least in my state, it is possible to get a duplicate title, so you can keep one at home and bring one with. Maybe you can get a duplicate title issued and sent to you.

4) Now for the good news--while I always had an original (duplicate) title with me, it was getting a bitty ratty so usually kept it in my document pouch and gave the police, and sometimes the border guys, a color copy on thick paper (I think I put some kind of embossed stamp on it for extra effect). This USUALLY worked, although I did have problems at a couple of borders, in particular entering Ukraine and leaving Latvia, where they seem to look for the watermarks which are present on the originals but lacking on copies.

In Ukraine I just told them it was all I had (I actually thought I've given him the original) and he finally let me through, but in Latvia, where I also gave them the copy by mistake, they didn't seem to want to let me through until I realized my mistake and gave them the original, then I was right through. I don't recall ever having a problem at the Russian border, and IIRC I usually gave them the copy. I speak Russian though, so that might have helped.

I can tell you a bit more about moto paperwork in Russia via pm if you are interested.

Whatever happens at borders, don't get frustrated, it doesn't help, just tell them that "that's how they do it where I come from".

5) I have no idea what a pink slip is and have never had one.

6) I think you might be wasting your money on an "international attorney", you are much more likely to get accurate, helpful, and free (!) advice on the Route Planning or Trip Paperwork subforums on this site.

I rarely check this subforum, if you have further questions post in the other subforums I mentioned or pm me.